Front cover means for stapling machines



Feb. 9, 1954 H. s. HELLER FRONT COVER MEANS FOR STAPLING MACHINES 4 Sheets-Sheet 1' Filed Aug. lO, 1949 INVENTOR. HAROLD S. HELLER A BY l @,Wmmm

FIG,

ATTORNEYS Feb. 9, 1954` H. s. HELLER FRONT COVER MEANS FOR STAPL-.ING MACHINES `4 Sheets=Sheet 2 Filed Aug. lO, 1949 INVENTOR.

HAROLD S. HELLER lvm ATTORNEYS Feb. 9, 1954 H. s. HELLER FRONT COVER MEANS FOR STAPLING MACHINES 4 Sheets-Shea..l 3

Filed Aug loI 1949 FIG-7 tllillll! INVENTOR.

HAROLD s. HELLER Feb. 9, 1954 H. s. HELLER 2,668,290

FRONT COVER MEANS FOR STAPLING MACHINES Filed Aug. lO, 1949 4 sheetsesheet 4 IN VEN TOR. HAROLD S. HELLER 7%., 'maw @www ATTORNEYS Patented Feb. 9, l1954 This invention relatesitoistaplngmaohinesiand Vthemeehanisrnvmfigf10, the.plungerfleiigminis moreparticularl ,to `a .stapleitaclrer Jaistl-Iertype @raised Lposition-.asythen"esJilt emaIiuaLdeQreSsQn 'held-in and operated-@by onezlfiand olf .ofrthehand operatedl'eilerf; and -thewuser thereof, and inwhieh thestaples aresuc- Eig. v.12 is a fragmentary .sectional view ofqthe essivelyldriveniby the force@foampressedspring .rear-rendofpthe tanker, .wlthxmeans forpreyenting Ameans bearing .against aaplunger toi-Which the accidentaldisoonnection.andevreleasexofnthestaple Vstaple :driving blade is secured Y:for movement follower.

herewith therpiung-er .and the `.staple ...driving Before specifically describing the staple iQil :blade .beingr manually-.raised gior e@impressionV of here, illustrated, vltfisto Ibe,z Iuml,clfSJ'fOimL that tkie '-being @-automatieally .released for -1 staple driving Darts heresnowzr as talrers mboiy'rr 1the.springf.mear1s-hy operation of a--leverzooiil0 inventcanhereinlolvedisnet lir^iite s te mestruaeveniently located-eadjacenttheitacker.handle-.and turalzdetails or the particular .a Aangeigriergt .Qf

l M g illp' purposes. k ent 'invention :may take, i otllQIjfQrm.. :cltlalSO is. 15.0 The inventionhasffor .fits primary .obieetytlie be, understQQdthatthe-terminology or @ligaseprovisionofan limprovedstaple, tanker which is 15 Glugy 'herenllsed is \or.;Dll1pQS Off-description characterized by its vstmCtural .smplicty, fthe andlnotroi-alimitatlan, iszthze Y0 .Pffnt ...economyeftS.. manuraeture,theease andzveeninvention is denoted by theepealefl Qlaims. v`wanience withy whiebitsxparts may/be assembled The staple tacker hel'eillli %.t. d.. f;Qr. @he-:QE- fanddisassembled,ftheureadyaeess.wirklichtisaf- 219511K@ 50i llfmfl-iflyeio, QQmplse a romeni .to au interiorpartaeitsstronasturdy 20 metal frameapreferably fQrmedas-asli. ,Staa and :dui-able.nature,` the.. easel otitsoperation, im and Lhavneas .integral lelrtsi. i 4Staple driving nul-noses, ,and istsveeneraloperatine right.headrortien Hl, its emeieney. `vertier; being Qieharmel li .l1 fifEurther obieetsef :the present. invention, and Vstalls. '-H, and. l @thereof extending ieri Kcertain Lof its;praeticalaelvantages, Twill-he reg5 .pmlidngtheleleetween anelongamted, fermato inerwwiirbeevident imm the-fonemas jilfiely upright @learnt.erv .d A -deseriptmniofastapieiaeker;@bearing-,the :scribed steel@ l 'ne mechanism 1 A .f ivention,-. asfillustratedin .the aecompanyingadlawmgatedpase nortion .Y 4;,1of ingslinwhioh -.Qhanx 1el s'liape :Fie 1 is ka.;,perspectiwe.View Qfsiiahptaelrer; -.i11g.A 2 isa longitudinal seetionalxyewthereef; -i-Eigfafis. afdetail,crossesectionalx of the tanker .headf.fportorv1,. :the Mew; bananas@ 1 -fnositionsfor-staple-fdriwineimages; fvWardl-yirflm there@ en ftlfialilh'dle p sec;-y

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Galand 17:1", chE-ia@ resine@ ntary rear-Mew el? Fig. l0 is a fragmentary side view,l:paift1yiinele and aS here ShOWn, the handle 190p SSCQD 74S: @f mation and partly :in section,.showingthe staple upwardly. ,opening 7channel:sluipetevvzppro fiile a ta'elger with a-rnod-ied form Aof mechanismbe- 50 ParflatiaHy spaced, uplghtmauntilg @.Ilgs 'IWenthlpllrmg??mdfthe hnd-.evlffol Opelaw'fm'the hereinafter described Opera'bng'meaus tionofjheplirngerin tlie staple liriyirig operafor thestaple drivingmeehanism, andptherame @gatherers here shownwih -tlhe'rluiieemn head. @www 'iwfvidedn ihefrear'surfae f ,iis'nermal lewerefir@ im; its 1199er ,eedfseetioe with a Pair -Off laterally 11 isa view corresponding to and showing 55 `spaced'rearwardly'extenling "mouii'ting agesZ-I 3 for the hand lever 22 of said operating means, the flanges 2| of the frame head portion I0 and the anges 2li of the frame handle section I'I preferably being, as here shown, continuations of one another.

The chamber I3 of the frame head portion I0, for the staple driving mechanism, is closed except at its lower end by a pair of upper and lower front cover members 23 and 24. In the present embodiment of the invention, the forwardly extending side walls Il and I2 of the frame head portion I are provided throughout their lower end portions with a pair of forwardly projecting side wall extensions and 26, upon and over which the lower cover member 24 is slidably mounted. As best shown in Figs. Il and "I, the lower front cover member, which preferably is formed as a die casting, is of channel shape in cross section, with its side walls 21 and 28 provided along their rear ends with inwardly extending beads or ribs 29 for engagement behind the outwardly extending beads or ribs 36 with which the side wall extensions 25 and 26 are provided along their front ends. As shown in Figs. l and 4, the lower end portions of the side wall extensions 25 and 26 of the frame head portion Iil and the lower end portions of the side walls 21 and 28 of the lower cover member 24 are of inwardly tapering form, with the result that said cover member can be telescopically associated with said side wall extensions only by sliding said cover member upwardly therealong, as will be readily understood. Means is provided, of course, for the releasable retention of the lower cover member 24 in telescopic covering relationship with the side wall extensions 25. and 26 of the frame head portion, but such means will be later described.

Inasmuch as the upper end sections of the forwardly extending side walls II and I2 of the frame head portion I0 have no side wall extensions, such as the lower side wall extensions 25 and 26, the upper cover member 23, which is of channel shape in cross section and preferably formed as a die casting, not only serves as a front and top closure for the upper end portion of the head chamber I3 but also, as a means to increase the depth of said upper end portion of said chamber to correspond to the depth of the lower end portion thereof, as provided by the side wall extensions 25 and 26. The upper cover member is therefore removably secured to the upper section of the frame head portion I0 with its rearwardly extending side walls 3l and 32 in alignment or registry with the forwardly extending head portion side walls II and I2, the

securement being eected by the use of screws 33, there being two such screws (Fig. l) extending rearwardly through the cover member side walls into the head portion side walls and one such through the rear surface of the head portion into a rearwardly extending block-like projection 34 with which the upper cover member 23 is integrally provided at its upper end to close the 'upper end of that portion of the head chamber "I3 which is between the head portion side walls II and I2.

Although the lower end of the upper cover member rests upon the lower side wall extensions screw (Figs. 2, 3 and 5) extending forwardly strengthen and rigidify the connection of these two parts. As here shown (see Fig. 3) said interlocking means comprises a pair of relatively small block-like lugs 35 on opposite sides of the rearwardly extending top closure projection 34 and which lit into a pair of recesses 36 in the head portion side walls I I and I 2 and also, a forwardly projecting extension 31 at the top of the frame head portion, between the side walls thereof, which overhangs or overlies a shoulder 38 of the cover member closure projection 34, a shoulder which is provided by making such projection of stepped form, as clearly shown in Figs. 2, 4 and 5. If desired, the upper cover member 23 may be provided at the lower end of its front surface with a depending flange 39 which overhangs or overlies the upper end portion of the front surface of the lower cover member 24, with said lower cover member being provided with a suitable recess 40 to receive said flange, as clearly shown in Figs. l, 2, 4 and 5.

The means for releasably maintaining the lower cover member 24 in telescopic covering relationship with the side wall extensions 25, 26 of the frame head portion I0 comprises a simple wire spring of channel form, the side arms 4I of which lie alongside the two cover members, with the inwardly coiled or hook-shaped upper ends 42 of the spring side arms underlying the upper cover member and being secured to the frame head portion by the rearwardly extending upper cover member screws 33. As shown in Figs. 1 and 2, the middle or cross portion 43 of the spring overlies the front surface of the lower cover member 24 and has snap seating engagement in an undercut groove or slot 44 extending across said lower cover member, as clearly shown in Figs. l and 2. 'I'o permit the lower end portion of the spring to be readily swung forwardly and rearwardly for the securement and the removal, respectively, of the lower cover member, the spring side arms 4I may be provided with coils 45 which serve as hinges for the swinging movement of the lower end portion of the spring,

,. as will be readily understood, preferably, the

side walls of the upper cover member are provided at their rear corner portions with suitable recesses or cavities 45a to receive the side arm coils 45 of the spring, as shown in Figs. l and 4.

Closely tting and slidably mounted within the head chamber I3 is a plunger 46 which is normally urged downwardly against a stop or ledge 41 in the lower end portion of the chamber I3 by a pair of coiled compression springs 48, the lower ends of which are seated in cavitiesv 49 in the upper end portion of the plunger 46, the upper ends of said springs engaging the headed upper ends of a pair of guide pins 5B arranged within said springs, with the headed upper ends 5I of said guide pins bearing against the" top end closure of the upper cover member 23, as best shown in Figs. 2 and 5. To cushion the downward impact of the plunger 46 against the stop or ledge 41, which preferably is an integral part of the frame head portion I0, a resilient pad 52 of rubber or the like may be 'placed'on the upper surface of said stop or ledge, as shown in Figs. 2 and 5.

As shown in Figs. 2, 4 and 5, the lower front portion of the plunger 46 is recessed to receive the head or upper end portion 54 of a staple driving blade 55, the lower end of which is provided with a curved recess 56 to conform to the shape of the crowns of the staples I6. For the removable but interlocking connection of the staple blade 55.

tac'ker in loverhead'work and thslike,v as be readily understood.

The staples I6, for use in the present tacler, are ofthe ordinary type, with` pointed legs and an arched-shaped crown. The staples are adhesively united in' strip form, as in usual, and are successively severed from the front end of the'strip and driven into the work by the downward power movement of the staple -driving As heretofore mentioned, the bar I for the support of the staple strip is arranged within the downwardly opening channel-shaped base vportion I4 of the tacker frame. As best shown in Ilig. 2, the front end portion of the staple supporting bar extends into the lower end portion of the frame head I0, with the front end of said bar terminating just rearwardly of the path of travel of the staple driving blade 55 and with the rear end of said bar terminating at the open rear end of the frame base portion I4.

For the support of the rear end portion of said bar, the frame base portion I4 is integrally provided with a cross web 85 (see Fig. 2), and for the support of the front end portion of said bar, the frame head portion I8 is integrally provided with a similar cross web 86, the bar resting upon said webs, as shown in Fig. 2. Between these cross webs 85 and 88, the tacker frame is open, but for such opening, aclosure strip 81 is provided, the closure strip snugly litting and closing said opening, as indicated in Figs. 6 and 9. As best shown in Fig. 6, the tacker frame is provided along the sides of this opening with shoulders 88 against which the side edge portions of the closure strip 81 are seated, with the closure strip being retained in position against the shoulders 88 and with the staple supporting bar I5 being held against its supporting cross webs 85 and 85 by screws 89 which extend upwardly through the closure strip and into the staple supporting bar.

To enable the staple supporting bar I5 to be readily located in proper position in the tacker frame and particularly with respect to the path of movement of the staple driving blade 55, the closure strip 81 is formed with a transverse rib 80 on its upper surface for seating engagement ina transverse slot 9I provided in the lower surface of said bar. Therefore, by rst placing the closure strip 81 in place, in which position the upper surface of the strip is preferably flush or in alignment with the upper surfaces of the bar supporting webs 85 and 85, it is a simple matter to determine the proper location for the staple supporting bar by merely moving said bar along the upper surface of said closure strip until the rib 98 of the strip enters the bar slot SI. When this occurs, the bar will be in proper pcsition within the tacker frame and the apertures of said bar which receive the attaching screws 89 will be in Vregistry with the screwreceiving apertures of the closure strip. All that is then necessary is to insert and tighten the screws 89, as will be readily understood. If desired and as shown in Figs.'6 and 9, the closure strip 81 may be provided along its upper surface with a pair of longitudinally disposed, laterally spaced ribs 92, between which the staple supporting bar is slid in the positioning thereof and between which it thereafter retained.

` As shown in Figs. 2, 4 and 5, the staple supporting bar I5 is here provided at its front end with a pair of laterally and oppositely extending base flanges 93 and at its rear end with corresponding flanges 94, flanges which give the bar,

of course, a more stable base. In order to insure proper positioning of the staple supporting bar within the tacker frame, the front end portion of the frame chamber for the reception of such bar is of slightly less width at the bottom thereof than the rear end portion of such chamber, and the front end flanges 93 of the bar are of slightly less lateral extent than the rear bar flanges 94. As a result, the bar can be completely inserted into the frame chamber therefor only from the rear end of the chamber and then only if the front end of the bar is inserted i'lrst.

The follower for normally urging the staple strip forwardly along the staple supporting bar, to thereby progressively feed the staples of the strip to a position in the path of movement of the staple driving blade, comprises a simple sheet metal member of inverted U-shape, which straddles the bar I5 just behind the staple strip and which is normally urged forwardly by the pressure of acoiled spring 9E. As best shown in Fig. 2, the spring 98 surrounds and is carried by a rearwardly extending rod 91, the front end portion of which is slidably mounted in an upright loop portion 98 at the top of the follower member 95, with the front end of said rod being bent upwardly to prevent disassembly of the rod and the follower member. The rear end portion of the follower rod is detachably connected in any suitable manner and by any suitable means to the rear end of the tacker frame base portion, with the follower spring 98 being confined in the desired degree of compression, for eiecting forward movement of the follower member, between such memberand a suitable stop or abutment at the rear end of the follower rod.

As here shown, for the detachable connection of the rear end portion of the follower rod 91 t0 the tacker frame base portion I4, and to provide the stop or abutment for the rear end of the follower spring 95, the rear end portion of the rod is bend forwardly and then rearwardly to form a hook 99 for detachable connection to the frame base portion at the rear of an aperture |08 at the top of such base portion, with the hook 98 being yieldingly and releasably held against the frame base portion by the pressure of the follower spring 98.

To insert a staple strip into the tacker and onto the supporting bar I5 therefor, it is merely necessary to remove the follower, which is readily done by pushing the follower rod forwardly to release the hook thereof, lift the rear end portion of the rod, and then pull the follower out. After insertion of the staple strip, the. follower is returned to position and the hook 99 of its rod reconnected to the frame base portion, all as will be readily understood.

Although tackers of the type here involved have wide fields of use, the tacker here illustrated is the stapling of wires, such as telephone wires, to walls, floors or other surfaces. To that end, the present tacker is so formed that it can be placed over and along the wire to be stapled, such as the wire A of Figs. 2, 6 and 9, to not only hold the wire in position but also, to insure that the securing staples will properly straddle the wire. For such purpose, the frame cross webs and 86, upon which the staple supporting bar I5 rests, are located slightly above the lower edges IBI of the adjacent side wall portions of the tacker frame, with the consequent provision of wire-receiving grooves below said webs, as clearly shown in Figs. 6 and 9. The bottom end locked with said cover member in said slot for releasably securing it to said head portion.

3. In a staple tacker, a frame having an elongated chambered head portion for the reception of staple driving mechanism, the lower end section of the chamber of said head portion being open at its front, a front cover member for the lower end section of said chamber, and resilient wire means mounted on the sides of said head portion having removable seating engagement in an undercut recess on the front of said cover member for effecting its releasable securement to said head portion.

4. In a staple tacker, a frame having an elongated chambered head lportion for the reception of staple driving mechanism, the lower end section of the chamber of said head portion being open at its front, a front cover member for the lower end section of said chambernand a VU- shaped spring for releasably securing said cover member to said head portion, the side ampertions of said spring being secured to said head portion and the cross or bridge portion of said spring overlying the front wall of said cover member and being removably seated in a cross slot in such wall.

5. In a. staple tacker, a frame having an elongated chambered head portion for the reception of staple driving mechanism, the lower end section of the chamber of said head portion being open at its front, a front cover member for the lower end section of said chamber, and a U- shaped spring for releasably securing said cover member to said head portion, said spring having its cross or bridge portion removably seated in a cross recess of said cover member and the side arm portions of said spring being secured to said head portion and being provided with hingeforming coils for the movement of the cross or bridge portion of the spring into and out of the cover member recess.

6. In a staple tacker, a frame having an elongated chambered head portion for the reception of staple driving mechanism, the lower end section of said head portion being of forwardly opening channel shape in cross section, whereby the lower end section of the chamber of said head portion is open at its front, a channel-shaped front cover member for the lower end section of said chamber and having an endwise slidable telescopic connection with the channel-shaped lower end section of said head portion, and spring catch means on said head portion for releasabiy engaging said cover member to secure it in telescopic association with the lower end section of said head portion, this portion of said catch means engaging said cover member being made of wire.

7. In a staple tacker, a frame having an elongated chambered head portion for the reception of staple driving mechanism, the lower end section of said head portion being of forwardly open- ,f

ing channel shape in cross section to receive and to guide the lower portion of the staple driving mechanism, whereby the lower end section of the chamber of said head portion is open at its front, a channel-shaped front cover member for the lower end section of said chamber and having slidable telescopic straddling association with the channel-shaped lower end section of saidhead portion, said cover member and said head portion section having longitudinally disposed interlocking ribs whereby the telescopic staddling association of said cover member with said heads portion section can be effected only by endwise slidable movement of the cover member relative to said head portion section, and means connected to the frame and detachably connected to said cover member for releasably securing against longitudinal movement the cover member to said head portion section.

8. In a staple tacker, a frame having an elongated chambered head portion for the reception cf staple driving mechanism, the lower end section of said head portion being of forwardly opening channel shape in cross section to receive and to guide the lower portion of the staple driving mechanism, whereby the lower end section of the chamber of said head portion is open at its front, a channel-shaped front cover member for the lower end section of said chamber and having slidable telescopic straddling association with the channel-shaped lower end section of said head portion, said cover member being so formed that its telescopic straddling association with said head portion section can be effected only by endwise slidable movement of the cover member upwardly along said head portion section and its disassociation eiccted only by endwise slidable movement of the cover member downwardly along said head portion section, and means connected to the frame and detachably connected to said cover member for normally resisting downward slidable movement thereof relative to said head portion section to thereby releasably retain said cover member in telescopio straddling association with said head portion section.

9. In a staple tacker, a frame having an elongated chambered head portion for the reception of staple driving mechanism, the chamber of said portion being open at its front,`upper and lower front cover members for said chamber, means for removably securing said upper cover member to said head portion, and means carried by the securing means for said upper cover member for removably securing the lower cover member to said head portion.

10. In a staple tacker, a frame having an elongated chambered head portion for the reception of staple driving mechanism, the chamber of said head portion being open at its front; upper and lower front cover members for said chamber, fastening elements for removably securing said upper cover member to said head portion, and means having detachable connection with said lower cover member for releasably securing such cover member to said head portion, the securing means for said lower cover member being secured to said head portion by the fastening elements for said upper cover member.

11. In a staple tacker, a frame having an elongated chambered head portion for the reception of staple driving mechanism, the chamber of said head portion being open at its front, upperV and lower front cover members for said chamber, fastening elements for removably securing said upper cover member to said head portion, and means for removably securing said lower cover member to said head portion, the securing means for said lower cover member comprising a U- shaped spring having its side arm portions dependently carried by said fastening elements for said upper cover member and having its lower cross or bridging portion releasably seated beneath a retaining abutment of said lower cover member.

12. In a staple tacker, a frame having an e1on gated chambered head portion for the reception of staple driving mechanism, the chamber of said mmm movably securing againsinlongitudinafhmonement -fsaidlower' cover membeny to :said :head1-portion, the securing means for said lower covermember beingretained massembly with said head portion by the securement to said head portion of said upperfcover member.

13. In azstapleLtackergasframerhaving an elongated head portion of channelshape in cross section, 'the channel side walls'extending 1forwardly and providing the sidewalls oiachamber' apen at its'fi'ontfipr the lreception ostaple'idriving mechanism,'upperandlower*frontcoverzmembers of 'channel shape 'in cross section for forming; the, front portion of said' chamber, means. .'for removably' 'securing' the vupper cover member'ito VAthe* head portion 'with the sidei walls; roi? sn-ch Lcover member extending-rearwardly and in` alignment `.with `the "head portion Yside walls, :whereby theiupperiend section ofthe stapie; drivingrneehfanism*'receiving-chamberformeddby the channels When'- 'the` 'upper'cover `member- 'securedto the fhead portionis lorgreaterdepththan thezchannel in said hea-d portion, 'said'. lliead'portion 'being providedI below 'said upper 'cover member with forwardly *extending* sid-e wall` extensions which increase the 4depth ofthe lowerA end seption 'of u,

the-chamber approximately-ltothat of the upper end section of the chamber as afforded by the securement of the upper cover member, and means for removably securing the lower cover member to said head portion in telescopic association with its side Wall extensions.

14. In a staple tacker, a frame having an elongated head portion oi channel shape in cross section, the channel side walls extending forwardly and providing the side walls of a chamber, open at its front, for the reception of staple driving mechanism, upper and lower front cover members of channel shape in cross section for said chamber, means for removably securing the upper cover member to said head portion with the side Walls of said cover member extending rearwardly and in alignment with the head portion side walls, whereby the upper end section of the head portion chamber is increased in depth by the securement of the upper cover member to the head portion, said head portion being provided below said upper cover member with forwardly extending side wall extensions which increasethe depth of the lower end section of the head portion chamber to that of the upper end section of the chamber as aiiorded by the securement of the upper cover member, and means secured to said head portion above the lower cover member for removably securing the lower cover member to said head portion in telescopic association with its side wall extensions.

15. In a staple tacker, a frame having an elongated chambered head portion, a plunger and a staple driving blade carried thereby mounted in the chamber of said head portion for reciprocatory movement, said chamber being open at its front, upper and lower front cover members for said chamber, means for removably securing said upper cover member and means for removably securing said lower cover member to said head portion, and-a reiatireiyfthimguidingfandibearing istrip said1 plungerA and, saisis-Stacie :'chiying.

blade, .said guiding and? hearngtsttip beingz intereposed between; the. front; faces. auf; saidf-plungerv and isaid; stapler: driving, .blade and` tlieifrearzsuzt- Sfaces-ioi the1upper.and,flower frcover'fmembersz,

.16. Inastaplertaeker,eenzame hayinguaxraelongated chambered head portion;.'apiunge1ranr1aa staple:drivingl bladecarriedftherebysmounted in `thefchamber. ofsaidsfhead:pontiongfoirreciprdcaftory. `m`ovement, said chamber. being @pensaitits rfront, upper, and. lower trent:icoverzmemhers for said? chamber, means-:fior removably. :securing-:said uppers covervmembers; andfmeans'for removably `'securing said?lowerfcever member :torsaid head pmttion;and asrelatinelyithin gnidingiand'cbearing strip; Yfor said plunger Aand -said; staple :driving blade, ,said guidingandrbearing strip-@heingrintenposed k.between- .t-hef aligned. front-ifaces; idr iathe `plunger :and: the: -stapie .driving i'bladecarried thereby and; the; genera-ily 'alignedmear #surfaces ofi the upper-and lowericiover members, saidinpper cover; member being provided lwith stop .meansfor. endwiseimovemenb of said guiding saudi-'bean i :ing/strip` in `anfupward :direction and saiccflowerv cover-member- -being provided with stopauneans .for lendvvlise mevement of sucht-strip in -ar :downlwardadirection.

11. Inastapletacker,framerhavnganaelbnf gated ichamberedahead; portion fortherrecepticn ofstaple-v,driving1.mechanismtheiupperz-endirsece- `tien -ci the. chamber ver saidiIheadqportionbeing vopen at its iront vandeat :its top; :a .coverfimemben and means removably securing saidgzcovernfnrember tofisaid headrportion-cr closing. the. nicht andthe top of the fupper endzsectionizossaid chamber, said upper cover ymember being longitudinally interlocked against longitudinal movement in either direction with said head portion by interlocking portions integrally formed on said upper cover member and head portion separate from and independent of the means by which said cover member is removably secured to said head portion.

18. In a staple tacker, a frame having an elongated head portion of channel shape in cross section, the channel side walls extending forwardly and providing a chamber open at its front and at its top for the reception of staple driving mechanism, upper and lower cover members, means removably securing said cover members to said head portion for closing the front of the chamber thereof, said upper cover member being provided at its upper end with a rearwardly extending portion projecting into the channell shaped top section of said head portion for closing the top of the chamber thereof, and means for longitudinally interlocking against movement in either longitudinal direction the rearwardly extending portion of said upper cover member with said head portion. y

19. In a staple tacker, a frame having an elongated chamberecl head member portion for the reception of staple driving mechanism, the upper i end section of the chamber of said head member being open at its front and at its top, a cover member removably secured to said head member for closing the front and the top of the upper end section of said chamber, and two separate and independent means for longitudinally interlocking said members, one of said means including a shoulder on one of said members and an interlocking extension on the other of said members.

20. In a staple tacker, a frame having an elongated chambered head portion for the reception of'staple driving mechanism, the lower end section of the chamber of said head portion being open at its front, a front cover member for the lower end section of said chamber, and spring catch means on said head portion straddling said cover member and being detachably engaged therewith for releasably securing said cover member to said head portion.

21. In a staple tacker, a frame having an elongated chambered head portion, a staple driving mechanism in said chambered head portion, the lower end section of said chamber being of forwardly opening channel shape in cross section with an open front and with the lower portion of said staple driving mechanism wholly received and guided therein, a channel-shaped front cover member for the lower end section of said chamber and having slidable telescopic straddling association with the channel-shaped lower end section of said head portion for closing said open front while having means for guiding the front of 'the lower portion of said staple driving mechanism, said cover member being so formed that its telescopic straddling association with said head portion section can be eiected only by endwise slidable movement of the cover member upwardly along said head portion section and its disassociation effected only by endwise slidable movement of the cover member downwardly along said head portion section, and means connected to. the frame and detachably connected to said cover member for releasably securing against longitudinal movement the cover member to said head portion section.

22. In a staple tacker, a frame having an elongated chambered head member for the reception Aof staple driving mechanism, the upper end secltion of the chamber of said staple driving mechanism, the upper end section of the chamber oi' said head member being open at its front and at its top, a cover member removably secured to said head member for closing the front and the top of the upper end section of said chamber. and means for longitudinally interlocking said members together including a lug on one of said members interlocking in a recess on the other of said members with dimensions corresponding to said lug. v

HAROLD S. HELLER.

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